How to handle RichText from API in flutter? - flutter

Question

how to handle RichText incoming from API call?
I recieve a String full of inline styling as tags. I found this pub package:
https://pub.dev/packages/styled_text
which is rather useful. However it doesn't handle everything. For example I'm having difficulties in handling blockquote.
Anotherwords, what is the recommended way to handle a String with inline tags?

Answer 1

These Three are the Main Package for this :
import 'package:flutter_html/flutter_html.dart';
import 'package:flutter_html/html_parser.dart';
import 'package:flutter_html/style.dart';
Example :
import 'package:flutter/material.dart';
import 'package:flutter_html/flutter_html.dart';
import 'package:flutter_html/html_parser.dart';
import 'package:flutter_html/style.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.deepPurple,
),
home: new MyHomePage(title: 'flutter_html Example'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => new _MyHomePageState();
}
const htmlData = """
<h1>Header 1</h1>
<h2>Header 2</h2>
<h3>Header 3</h3>
<h4>Header 4</h4>
<h5>Header 5</h5>
<h6>Header 6</h6>
<h3>Ruby Support:</h3>
<p>
<ruby>
漢<rt>かん</rt>
字<rt>じ</rt>
</ruby>
is Japanese Kanji.
</p>
<h3>Support for <code>sub</code>/<code>sup</code></h3>
Solve for <var>x<sub>n</sub></var>: log<sub>2</sub>(<var>x</var><sup>2</sup>+<var>n</var>) = 9<sup>3</sup>
<p>One of the most <span>common</span> equations in all of physics is <br /><var>E</var>=<var>m</var><var>c</var><sup>2</sup>.</p>
<h3>Inline Styles:</h3>
<p>The should be <span style='color: blue;'>BLUE style='color: blue;'</span></p>
<p>The should be <span style='color: red;'>RED style='color: red;'</span></p>
<p>The should be <span style='color: rgba(0, 0, 0, 0.10);'>BLACK with 10% alpha style='color: rgba(0, 0, 0, 0.10);</span></p>
<p>The should be <span style='color: rgb(0, 97, 0);'>GREEN style='color: rgb(0, 97, 0);</span></p>
<p>The should be <span style='background-color: red; color: rgb(0, 97, 0);'>GREEN style='color: rgb(0, 97, 0);</span></p>
<p style="text-align: center;"><span style="color: rgba(0, 0, 0, 0.95);">blasdafjklasdlkjfkl</span></p>
<p style="text-align: right;"><span style="color: rgba(0, 0, 0, 0.95);">blasdafjklasdlkjfkl</span></p>
<p style="text-align: justify;"><span style="color: rgba(0, 0, 0, 0.95);">blasdafjklasdlkjfkl</span></p>
<p style="text-align: center;"><span style="color: rgba(0, 0, 0, 0.95);">blasdafjklasdlkjfkl</span></p>
<h3>Table support (with custom styling!):</h3>
<p>
<q>Famous quote...</q>
</p>
<table>
<colgroup>
<col width="50%" />
<col span="2" width="25%" />
</colgroup>
<thead>
<tr><th>One</th><th>Two</th><th>Three</th></tr>
</thead>
<tbody>
<tr>
<td rowspan='2'>Rowspan\nRowspan\nRowspan\nRowspan\nRowspan\nRowspan\nRowspan\nRowspan\nRowspan\nRowspan</td><td>Data</td><td>Data</td>
</tr>
<tr>
<td colspan="2"><img alt='Google' src='https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png' /></td>
</tr>
</tbody>
<tfoot>
<tr><td>fData</td><td>fData</td><td>fData</td></tr>
</tfoot>
</table>
<h3>Custom Element Support:</h3>
<flutter></flutter>
<flutter horizontal></flutter>
<h3>SVG support:</h3>
<svg id='svg1' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'>
<circle r="32" cx="35" cy="65" fill="#F00" opacity="0.5"/>
<circle r="32" cx="65" cy="65" fill="#0F0" opacity="0.5"/>
<circle r="32" cx="50" cy="35" fill="#00F" opacity="0.5"/>
</svg>
<h3>List support:</h3>
<ol>
<li>This</li>
<li><p>is</p></li>
<li>an</li>
<li>
ordered
<ul>
<li>With<br /><br />...</li>
<li>a</li>
<li>nested</li>
<li>unordered
<ol>
<li>With a nested</li>
<li>ordered list.</li>
</ol>
</li>
<li>list</li>
</ul>
</li>
<li>list! Lorem ipsum dolor sit amet.</li>
<li><h2>Header 2</h2></li>
<h2><li>Header 2</li></h2>
</ol>
<h3>Link support:</h3>
<p>
Linking to <a href='https://github.com'>websites</a> has never been easier.
</p>
<h3>Image support:</h3>
<p>
<img alt='Google' src='https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png' />
<a href='https://google.com'><img alt='Google' src='https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png' /></a>
<img alt='Alt Text of an intentionally broken image' src='https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_92x30d' />
</p>
<h3>Video support:</h3>
<video controls>
<source src="https://www.w3schools.com/html/mov_bbb.mp4" />
</video>
<h3>Audio support:</h3>
<audio controls>
<source src="https://www.w3schools.com/html/mov_bbb.mp4" />
</audio>
<h3>IFrame support:</h3>
<iframe src="https://google.com"></iframe>
""";
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: AppBar(
title: Text('flutter_html Example'),
centerTitle: true,
),
body: SingleChildScrollView(
child: Html(
data: htmlData,
//Optional parameters:
style: {
"html": Style(
backgroundColor: Colors.black12,
// color: Colors.white,
),
// "h1": Style(
// textAlign: TextAlign.center,
// ),
"table": Style(
backgroundColor: Color.fromARGB(0x50, 0xee, 0xee, 0xee),
),
"tr": Style(
border: Border(bottom: BorderSide(color: Colors.grey)),
),
"th": Style(
padding: EdgeInsets.all(6),
backgroundColor: Colors.grey,
),
"td": Style(
padding: EdgeInsets.all(6),
alignment: Alignment.topLeft,
),
"var": Style(fontFamily: 'serif'),
},
customRender: {
"flutter": (RenderContext context, Widget child, attributes, _) {
return FlutterLogo(
style: (attributes['horizontal'] != null)
? FlutterLogoStyle.horizontal
: FlutterLogoStyle.markOnly,
textColor: context.style.color,
size: context.style.fontSize.size * 5,
);
},
},
onLinkTap: (url) {
print("Opening $url...");
},
onImageTap: (src) {
print(src);
},
onImageError: (exception, stackTrace) {
print(exception);
},
),
),
);
}
}

Answer 2

You can use flutter_html to render html string.
flutter_html official documentation